Process of making soluble starch.



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in; manne 7 than whom/ it may concern:

Be it known that l, J mum's Knnrronowroz, manufacturer, a subject of the King of Prussia and the German Emperor, residing apt-'28 Goethe street, Breslau, Kingdom of Prussia, German Empire, have invented a new and useful Improvement in Processes for. Making Soluble Starch; and I do hereby declarethe following to be a full, clear, and exact description of'the same.

The present invention refers to a new process for making soluble starch soluble in boiling water and preserving the state of. solution on cooling, and on standing t Chillnary temperature.

It is known that by the action of mineral acids alone or by the action of persalts alone on starch, starch-is produced which is soluble in a small amount of boiling water but has the disadvantage that these solutions solidify or gelatinize on cooling. This be havior of the known solutions of soluble starch causes many disadvantages in the technical use of such solutions. Such solutions may only be used warm for sizing or gluing operations and in case that a cooling ofthe solutions had taken place, a rewarming must be eflected. It is known to prepare soluble starch, the soluticns of which do not solidify or gelatinize on cooling bytreating starch with largeamounts of glacial acetic acid at temperatures of at least l00degrees centigrade and distilling ed the acetic acid. This process,'however, has many ditlicu'lties, because the process can only be carried out in glass vessels which are of course very breakable. Metal vessels cannot be used, because metals are attacked by the required glacial acetic acid, especially at the necessary high temperatures.

- l have now found that one may prepare soluble starch, the solutions of which do not solidify or gelatinize on cooling, by causing organic acids, especially volatilizable organic acids, in the presence of substances apt to convert ordinary starch intosoluble, as small amounts of mineral acids orpersalts, to act on starch? Une can use small amounts of organic acid even in diluted state and can use vessels ol-wood'. The reaction may be accelerated by warming. In

this case my process shows the advantage that the heatin c be mm d may Specification of Letters Patent.

bne may Patented Dec. 5, thin.

Application filcdtlctoher 19, 1914. Serial lt'o. 867,511.

- be carried out at lower temperatures than the known process. lln-this way the used vessels are not attacked.

My process allows the use of vessels of wood, which cannot be used in the process using glacialacetic acid at temperatures above 1 00 degrees 'centigrade. For my process temperatures between 30 and 50 degrees centi'grade are sufficient.

Organic acids suitable for my process are for instance: formic acid, acetic acid, lactic.

acid, butyric-acid Suitable persalts are for instance the permanganates of potassium, sodium, c'alrziuin,- the persulfates of' potassium, sodium, ammonium, the pe'rborates of potassium, sodium, ammonium, also the persalts of thehea-vy metals.

In my process I may use organic acids together with mineral acids or with persalts or with mineral acids and persalts. lit is, however, necessary for my process that one uses besides the organic acids at the same time mineral acids or persalts or mineral acids and persalts.

Ewamplesf (1) 100 kilograms of starch, for instance potato starch, are mixed with 200 grams of potassium persulfate, and with 7 kilograms of acetic acid of 50 percentage or of an equivalent amount of more diluted aceticacid.

One allows the mixture to stand at ordinary temperature .for 12-24: hours. By warming for instance to30 degrees centigrade one may shorten the duratlon of the process.

The persullate may be preferably employed in dry state or in a highly concentrated so.-

gravity are mixed with each other and treated as indicated in Example 1.

(3) kilograms of starch, 7 kilograms of acetic acid of 50 percentage, 100 grams of'potassium persulfate, 1 kilogram of hydrochloric acid of 1.171 specific gravity are mixed with each other and treated as indicated in Example 1.

-A:tter the action having been completedneutralize the acidwith basic com- PQllJltdlS e-mnlim the gold by air;

with water. A distillation of the acidsas, necessary in the known process is therefore avoided.

' described in my Letters Patent 1105567. By

this modification one obtains a starch swelling-upin cold water. This starch has the l I claim:

advantage of giving with small amounts of water a, solution of high cementing power.

- 1. The process for making solublestarch,

the solutions of which do not solidify or' gelati nize atordinary temperature which consists in causing to act on starch dilute organic acids togethe ith substances converting starch into s luble starch.

2. The process'for making soluble starch, the solutions of which do not solidify or gelatinize at ordinary temperature which consists in causing to act organic acids together with persalts on starch.

3. The process for making soluble starch,

"the solutions of which do not solidify or gelatinize at ordinary temperature which consists in causing to act organic acids together with persalts and mineral acids on starch.

In testimony whereof I havesigned my name to' this specification in the presence of 40 two subscribing witnesses. O i

v JULIUS KANTOROWIGZ.

- Witnesses:

' ERNST KA'iz,

HANS LIEPHE. 

